URL stored in mails never mention the gedcom file they
come from.
For example this mail was not sent from the default
gedcom but from another one:
http://www.ghezibde.net/genealogie/pedigree.php?PEDIGREE_GENERATIONS=4&rootid=I7&show_full=1&talloffset=1
it would be useful to know about the gedcom that
provided the link.